#include "Date.h"

#define _CRT_SECURE_NO_WARNINGS 1

Date::Date(int year, int month, int day)
{
	 _year=year;
	 _month=month;
	 _day=day;
}

void Date::Print()
{
	cout << _year << "-" << _month << "-" << _day << endl;
}

Date& Date::operator+=(int day)
{
	_day += day;
	while (_day>GetMonthDay(_year,_month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}

	return *this;
}

Date Date::operator+(int day)
{
	Date tmp = *this;
	tmp += day;
	while (tmp._day > GetMonthDay(_year, _month))
	{
		tmp._day -= GetMonthDay(_year, _month);
		++tmp._month;
		if (tmp._month == 13)
		{
			tmp._year++;
			tmp._month = 1;
		}
	}

	return tmp;
	
}

Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			_year--;
			_month = 12;
		}
		_day += GetMonthDay(_year, _day);
	}
	return *this;
}

Date Date::operator-(int day)
{
	Date tmp = *this;
	tmp += day;
	while (tmp._day < 0)
	{
		--tmp._month;
		if (tmp._month == 0)
		{
			tmp._month = 12;
			tmp._year--;
		}
		tmp._day += GetMonthDay(_year, _day);
	}

	return tmp;
}


